yuhao yang created SPARK-22381:
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Summary: Add StringParam that supports valid options
Key: SPARK-22381
URL: https://issues.apache.org/jira/browse/SPARK-22381
Project: Spark
Issue Type: New Feature
Components: ML
Affects Versions: 2.2.0
Reporter: yuhao yang
Priority: Minor
During test with https://issues.apache.org/jira/browse/SPARK-22331, I found it
might be a good idea to include the possible options in a StringParam.
A StringParam extends Param[String] and allow user to specify the valid options
in Array[String] (case insensitive).
So far it can help achieve three goals:
1. Make the StringParam aware of its possible options and support native
validations.
2. StringParam can list the supported options when user input wrong value.
3. allow automatic unit test coverage for case-insensitive String param
and IMO it also decrease the code redundancy.
The StringParam is designed to be completely compatible with existing
Param[String], just adding the extra logic for supporting options, which means
we don't need to convert all Param[String] to StringParam until we feel
comfortable to do that.
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